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Get Very Low Performance with MP Linpack benchmark in HPC cluster

ctminh
Occasional Contributor

Get Very Low Performance with MP Linpack benchmark in HPC cluster

Dear all,

I have a problem with the result of MKL MP_Linkpack. In my system, I have 24 compute nodes with both Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz and Xeon Phi Q7200, RAM 256GB. On each node, I run ./runme_intel64, the performance is good ~ 700-900 GFlops (only Xeon CPU).

But when I run HPL on 4 nodes, 8 nodes or more, the result is very bad, sometimes it cannot return the result with the error: MPI TERMINATED,... After that, I run the test (runme_intel64) on each node again, and the performance is very low:

~ 11,243 GFLops,

~ 10,845 GFlops,

....

But I don't know the reason why, I guess the reason is the power of cluster (it is not enough for a whole system) and HPE Bios configured is Balanced Mode for the cluster (automatically change to lower power mode when the system cannot get enough the power). But when I just run on some nodes and configure the power is maximum, the problem is still not solved.

Please help me about this problem, thank you all!

Minh Chung